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Main Cast
- Lee Ji Ah as Shim Soo Ryun
- Kim So Yun as Chun Seo Jin
- Eugene as Oh Yoon Hee
Shim Soo Ryun’s family (100th Floor)
- Uhm Ki Joon as Joo Dan Tae
- Kim Young Dae as Joo Suk Hoon
- Han Ji Hyun as Joo Suk Kyung
Chun Seo Jin’s family (85th Floor)
- Yoon Jong Hoon as Ha Yoon Chul
- Choi Ye Bin as Ha Eun Byul
- Jung Sung Mo as Chun Myung Soo (Seo Jin’s father)
- Hye Min as Seo Jin’s mother
- Shin Seo Hyun as Chun Seo Young
- Ahn Tae Hwan as Seo Jin’s brother-in-law
Oh Yoon Hee’s family
- Kim Hyun Soo as Bae Ro Na (Oh Yoon Hee’s daughter)
Lee Kyu Jin’s family (55th Floor)
- Bong Tae Kyu as Lee Kyu Jin
- Yoon Joo Hee as Go Sang Ah
- Lee Tae Bin as Lee Min Hyuk
Kang Ma Ri’s family (45th Floor)
- Shin Eun Kyung as Kang Ma Ri
- Heo Sung Tae as Yoo Dong Pil
- Jin Ji Hee as Yoo Je Ni (Ma Ri’s daughter)
Go Sang Ah’s In-Laws
- Seo Hye Rin as Wang Mi Ja
- Heo Ji Na as eldest sister-in-law
- Lee Cho Won as youngest sister-in-law
Chungah Art School
- Son Bo Seung as Uhm Jang Dae
- Ahn Eun Ho as Ahn Eun Hoo
- Yang Jung Min as Noh Ji Ah
- Park Soo Ah as Song Ye Ri
- Jang Ha Kyung as Heo Yoo Jung
People with secrets
- Jo Soo Min as Min Sul Ah
- Lee Chul Min as Yoon Tae Joo
- Kim Ro Sa as Yang Mi Ok
- Na So Ye as Joo Hye Min
- ark Eun Suk as Logan Lee
Supporting Cast
- Park Eun Suk as Goo Ho Dong
- Byun Woo Min as Jo Sang Hun
- Ha Do Kwon as Ma Doo Ki
- Choi Seo Yun as Kwon Hye Mi
- Kim Do Hyun as secretary Do
- Kim Dong Kyu as secretary Jo
- Jung Ah Mi as Chairman Song
Additional Cast for season 2
- Ki Eun Sae as Reporter Kim Jung Min
- Ahn Young Hong as Jin Boon Hong
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